2. Questions Bank
  3. 12th Class
  4. Physics
  5. Magnetism

12th Class Physics Magnetism Question Bank Case Based (MCQs) - Moving Charges and Magnetism

  • question_answer
                                       Q.4.     The magnetic moment of a current l carrying circular coil of radius r and number of turns N varies as:

    A)     \[\frac{1}{{{r}^{2}}}\]

    B)             \[\frac{1}{r}\]

    C)             r                      

    D) \[{{r}^{2}}\]

    Correct Answer: D

    Solution :

    (d) \[{{r}^{2}}\] Magnetic moment, \[M=NIA=Nl\pi {{r}^{2}}\text{ }i.e.,\text{ }M\propto {{r}^{2}}\].            


You need to login to perform this action.
You will be redirected in 3 sec spinner